Active state

{
  "id": "MLC-T-CHM-000191",
  "term": "Active state",
  "field": "Chemistry",
  "definition": "A surface site in heterogeneous photocatalysis that is electronically excited, or that holds a charge carrier which light produced and which became trapped, and that reacts with species at the interface to form products or intermediates. In corrosion the active state is the condition in which a metal dissolves by direct transfer of metal ions into the electrolyte, in contrast to the passive state covered by a protective film. The corrosion current of a metal in the active state usually rises as its electrode potential is made more positive.",
  "subject": "Physical and Biophysical Chemistry",
  "see_also": [
    "photoadsorption centre",
    "photocatalytic centre",
    "corrosion",
    "electrode potential"
  ],
  "references": [
    "PAC, 2011, 83, 931. 'Glossary of terms used in photocatalysis and radiation catalysis (IUPAC Recommendations 2011)' on page 939 (https://doi.org/10.1351/PAC-REC-09-09-36)",
    "PAC, 2011, 83, 931. 'Glossary of terms used in photocatalysis and radiation catalysis (IUPAC Recommendations 2011)' on page 940 (https://doi.org/10.1351/PAC-REC-09-09-36)",
    "PAC, 1989, 61, 19. 'Electrochemical corrosion nomenclature (Recommendations 1988)' on page 21 (https://doi.org/10.1351/pac198961010019)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/active-state/"
}